Danish Prime Minister Mette Frederiksen has called on U.S. President Donald Trump to stop making threats about taking control of Greenland. Her remarks came after Katie Miller, wife of Trump aide Stephen Miller, posted a map on social media showing Greenland in U.S. flag colors with the caption “soon.” Frederiksen said there is no justification for the United States to claim any of the three territories under the Danish Kingdom and emphasized that Denmark, as a NATO member, includes Greenland within the alliance’s security framework.

Frederiksen noted that Denmark already has a defense agreement with the United States granting access to Greenland and that her government has increased investment in Arctic security. She urged Washington to stop threatening a close ally whose people have clearly stated they are not for sale. Hours later, Trump reiterated aboard Air Force One that the U.S. needs Greenland for national security and that Denmark cannot prevent it.

The dispute follows the U.S. appointment of a special envoy to Greenland in December 2025, which angered Denmark. Most of Greenland’s 57,000 residents oppose becoming part of the United States despite some support for eventual independence from Denmark.

Denmark’s national postal service, PostNord, announced it will deliver its final batch of letters on December 30, 2025, marking the end of a 400-year-old tradition that began in 1624. The decision follows a dramatic decline in letter volumes, with mail usage dropping by over 90% in the past 25 years as digital communication and e-commerce reshaped postal demand.

As part of the transition, PostNord will lay off around 1,500 employees and remove 1,500 of its iconic red mailboxes. The company has already sold 1,000 mailboxes within hours of listing them, with additional units set for auction in January. Private courier DAO will expand its letter delivery services from January 1, offering online payment and home collection options.

Experts note that while physical letters are fading, their emotional and cultural value is rising. Younger Danes, particularly those aged 18–34, are reportedly sending more letters than older generations, viewing handwritten correspondence as a meaningful counterbalance to digital saturation.

Denmark has summoned a top U.S. diplomat following reports that several Americans attempted to covertly influence Greenland’s society and promote alignment with the United States. Danish intelligence warned of ongoing influence operations targeting the autonomous region. Foreign Minister Lars Løkke Rasmussen stressed that any interference in internal affairs is unacceptable. The move comes amid President Trump’s repeated interest in acquiring Greenland, sparking concern in Denmark and highlighting tensions over foreign involvement in the strategically important Arctic territory.